9791221979 has 16 divisors (see below), whose sum is σ = 12211180800. Its totient is φ = 7627059360.

The previous prime is 9791221861. The next prime is 9791222027.

9791221979 is nontrivially palindromic in base 10.

9791221979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9791221979 - 2²⁰ = 9790173403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9791229979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240872 + ... + 278570.

It is an arithmetic number, because the mean of its divisors is an integer number (763198800).

Almost surely, 2^9791221979 is an apocalyptic number.

9791221979 is a deficient number, since it is larger than the sum of its proper divisors (2419958821).

9791221979 is a wasteful number, since it uses less digits than its factorization.

9791221979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41090.

The product of its digits is 1285956, while the sum is 56.

The square root of 9791221979 is about 98950.6037323674. The cubic root of 9791221979 is about 2139.3358333566.

The spelling of 9791221979 in words is "nine billion, seven hundred ninety-one million, two hundred twenty-one thousand, nine hundred seventy-nine".